This is the first I’ve heard of it. I can definitely get down with it.
Discussion
There’s about 5 more different denominations, including units which are smaller than sats and exist only on the lightning network.
I personally only use full Bitcoin or sats though. Anything else is generally way too confusing for newcomers and there’s no reason why prices can’t be displayed as 0.00056778 or 56,778. Making a different category where it’s displayed as 567.78 just feels weird.